How to check out public IP on Linux

We are able to check at our Public address as following ways:

 

[root@zmail axon]# dig +short myip.opendns.com @resolver1.opendns.com
111.93.119.34
[root@zmail axon]# curl ifconfig.co
111.93.119.34
[root@zmail axon]# curl ifconfig.me
111.93.119.34